DATACMNS-1240 - Update copyright years to 2018.

Also, remove some trailing whitespaces and align outdated license header format.

src/test/java/org/springframework/data/transaction/ChainedTransactionManagerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2013 the original author or authors.
+ * Copyright 2011-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,7 +30,7 @@ import org.springframework.transaction.support.DefaultTransactionDefinition;
 
 /**
  * Integration tests for {@link ChainedTransactionManager}.
- * 
+ *
  * @author Michael Hunger
  * @author Oliver Gierke
  * @since 1.6